A. Is the hardest metal in common use
B. Is the lightest metal in common use
C. Cannot be scratched by finger nails
D. Cannot be work hardened
Related Mcqs:
- Spark plugs are made of______________________?
A. High alumina ceramic
B. Metallic carbides
C. Corundum
D. Carborundum - Mixing vessel used for the chlorination of methane to produce methyl chloride is made of___________________?
A. Copper
B. Cast iron
C. Aluminium
D. High carbon steel - Glass is corroded by________________?
A. Fluorine (dry or wet)
B. Sulphuric acid
C. Phosphoric acid
D. None of these - White cast iron as compared to grey cast iron is ________________?
A. More durable
B. Very brittle
C. Very hard
D. All A., B. & C. - The hardest material just prior to diamond in Mhos scale is_________________?
A. Topaz
B. Carborundum
C. Corundum
D. Calcite - The main constituent of carborundum is ___________________ carbide?
A. Calcium
B. Silicon
C. Boron
D. Aluminium - Metal at the top of the electromotive series is________________?
A. Least active
B. Most stable
C. Most active
D. Most noble - Rubber lined vessels are corroded by the action of__________________?
A. Aqua regia
B. Chloroform
C. Sulphuric acid (95%)
D. All A., B. and C. - Molten phthalic anhydride is stored in a/an _______________ vessel?
A. Aluminium
B. Nickel clad steel
C. Lead lined steel
D. Glass lined steel - A steel alloy containing 36% nickel is called _____________________, which has a zero co-efficient of expansion?
A. Austenitic stainless steel
B. Heat resisting steel
C. Invar
D. High speed steel
